drawbridge machinery / adequate food supply / poured cement column / air transportation / oil / food / considerable search / auxiliary food supply / individual sponge rubber capsules / steep bank / wild nesting site / insulated telephone / cement / fuel oil / large telephone poles / /
NaturalFeature
Rocky Mountains / Umpqua river / Cascade mountain range / Siuslaw river / Oregon coast / San Francisco Bay / Camp Creek canyon / Mount Nebo / Pacific coast / Willamette Valley / Willamette National Forest / /
Organization
Oregon Audubon Society / US Federal Reserve / Forest Service / /
Person
Purple Martins / Ben Pruitt / Michael Oboiko / William Schnorenberg / Purple Martin / Dunsmoor / Huey / William Vogt / /
Position
writer / Major / swaying head / /
Product
eggs / moisture / /
ProvinceOrState
Oregon / Washington / California / Arizona / Massachusetts / Arkansas / /
Region
central Oregon / west coast / southern United States / western North America / WESTERN OREGON / eastern Oregon / /